US1340436A

US1340436A - Floating-weight sound-box

Info

Publication number: US1340436A
Application number: US274775A
Authority: US
Inventors: Cassca Erwin
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-02-03
Filing date: 1919-02-03
Publication date: 1920-05-18
Anticipated expiration: 1937-05-18

Description

I E. CASSCAQ FLOATING WEIGHI SOUND BOX.

APPLlCATiON FILED FEB. 3. 1919. 1,340,436. Patented May 18, 1920.

Eiaw'nv oAssoA, or GLovERsvILLE, iv'Ew YORK.

Specification of Letters Patent.

Patented May 18, 1920.

Application filed February 3, 1919. Serial No. 274,775.

to a floating Weight and the connection of the stylus lever thereto, the said lever being connected with the diaphragm through an intermediate lever and flexible connector, whereby to absorb local vibrations and to reproduce through the diaphragm the recorded vibrations, and to increase the accuracy and tone of the reproduction.

The invention in the preferred form is illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation, partly in section, showing my invention as applied to a sound box. Fig. .2, is an end elevation, and Fig. 3, is a plan view of the stylus and the supports therefor.

The improved sound box is here shown as comprising a base 1, approximately circular in plan, and having a lateral arm 2 projecting therefrom. The base 1 is provided approximately centrally thereof with a sound or diaphragm receiving opening 3.

A weight arm 1 is secured at one end through a spring strip 5, to the terminal of arm 2 of the base, being provided at the opposite end with a limiting member 6,'in the form of a rod having its hooked upper end 7 playing between the side bars of a U shaped stop. 8 secured to the base, the cross bar of the stop preventing possibility of undue-movement of the weight arm in one direction, as when the sound box is not in use. The weight arm is provided with an annular wall 9 on the upper side thereof forming a chamber coinciding with sound opening of the base, the edge of said wall,

when the sound box is inplace on the record approaching the diaphragm to thus confine the diaphragm in a closed space. weight arm is provided on its lower side with depending ears 10 between which at 11 is pivotally supported a stylus lever 12. This lever carries the usual stylus 13 removably secured at the inner 'end thereof in any convenient manner. The stylus lever is formed at its outer end with an inverted L-shaped extension 1 1, the normal horizontal portion of which overlies the outer end of a lever 15 also pivotally supported between the ears and connected at its inner end, preferably through a cord or similar flexible connection 16, with the diaphragm, the weight arm having an opening 17 for the passage of such connection. The cooperating ends of the lever 15 and the overlying portion of the extension Mof the stylus lever are formed to present similar inclined surfaces 18, so that the 'movement of the stylus lever in following the record will be imparted to the lever 15 and through this lever to the diaphragm.

It is obvious that the floating weight arm in connection with the variousparts and stylus as herein shown and described provide a structure which will absorb to a great degree any foreign or local undesirable vibrations and one which will tend to reproduce the pure recorded vibrations.

I claim A sound box having a diaphragm, a weight arm connected for free movement in relation to the box, a stylus lever carried by the weight arm, an intermediate lever carried by the weight arm, and a connection intermediate one end of said last mentioned lever and the diaphragm, the respective The i levers being formed with inclined interfitting faces. In Witness whereof, I have hereunto subscribed my name this 3d day of June, 1918.

ERWIN CASSOA,